The heaviest rain has fallen between Lucinda and Townsville in northern Queensland, and the Bureau of Meteorology warns that the big wet will continue for days.
Nearly one metre of rain was recorded at Paluma Dam in Townsville in the last 48 hours, while Ingham has copped more than 400mm in the last day.
The continued deluge has swollen waterways, and major flood warnings are in place for the Herbert River, the Ross and Bohle River, the Horton River, and the Upper Burdekin River.
Meteorologist Dean Narramore said persistent widespread rain will subside in the afternoon but increase again from Tuesday.
"There will possibly be some breaks in the rainfall but we don't totally clear out of the rainfall for quite a while," he said.
Two people were saved from the roof of their car, which was submerged in floodwaters in Woodstock around 7 p.m., while another person was rescued from a truck stuck in floodwaters in Basalt.
A 63-year-old woman died on Sunday when a SES boat helping people through floodwaters struck a tree and flipped in Ingham.
Premier David Crisafulli says the flood disaster rivalled the 1967 emergency that completely submerged Ingham.
"This is a big one," he told the Nine Network on Monday.
"To put it into perspective the 1967 flood which everybody talks about as the one in 100 years that was about 15.2m.
"Well (the Herbert River) remains close to 15m and has been so for some time."
"To see the images of people's homes and businesses and farms, you know, they're people I grew up with," he told Sky News.
"So of course, it's personal but ultimately, we've got a job to do, and that job is to make sure that people get the message and get themselves safe."
Multiple evacuation warnings are in place for regions across the far north, with residents in Cardwell the latest to be told to leave.
The Ingham area and Ross River "black zone" in Townsville, which spans Cluden, Hermit Park, Idalia, Oonoonba, Railway Estate, and Rosslea, have been told it's not safe to return home.
More than 9000 northern Queenslanders remain without power after the Ingham substation was switched off due to floodwaters.
"It's some of the worst inundation we've seen in this beautiful community," Ergon Energy said.
The state government has activated hardship payment support for residents of Hinchinbrook, Palm Island, Townsville, and Gordonvale who have been impacted.
With AAP.
